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We consider the 3-user Gaussian interference channel and provide an outer bound on its capacity region. Under some conditions, which we call the mixed strong-very strong interference conditions, this outer bound is achievable. These conditions correspond to the case where at each receiver, one transmitter is causing strong interference and the other is causing very strong interference. Therefore,...
This paper investigates the degrees of freedom of the interference channel in the presence of a dedicated MIMO relay. The relay is used to manage the interference at the receivers. We pose a fundamental question: What benefits are achieved by exploiting the direct links from the sources to the receivers and whether a two-hop strategy suffices considering the pre- log factor in the capacity formula?...
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